Sorry, Hollywood screenwriters. Sometimes the best lines in films AREN’T the ones you wrote down in the script!

In fact, some of the most famous scenes in movies are completely improvised on the set! An actor will do or say something that just feels right and…

Ta da!

Cinema magic!

Like Heath Ledger in his posthumous Oscar-winning role as The Joker in The Dark Knight. No one instructed Heath to applaud like he did while Commissioner Gordon’s promotion was announced at Gotham’s Police Headquarters. But Heath gave director Christopher Nolan a take with a slow clap that was just too good (and evil) not to use!

Want to see which other scenes were unplanned but went on to become onscreen classics?

No. They didn't win a bet, or invest in a company that suddenly hit it big!

Taking a break from his post-wedding bliss, Brad Pitt, alongside Leonardo DiCaprio & Robert De Niro reportedly earned a cool $13 million each for about two days of old fashioned work - more specifically, filming a commercial!

The alleged ad, directed by Martin Scorsese and written by Boardwalk Empire creator Terence Winter, is for business moguls Lawrence Ho and James Packer’s Macau casino, Studio City.

Hollywood heavyweight Brett Ratner supposedly produced the $70 million mini-movie - which will debut as part of the casino’s massive launch next year!

No confirmation from any of the actors' PR peeps, but we wouldn't be surprised if this massive payout was the real deal! These A-listers are at the top of their game!